A new extractant,[N,N-di(2-ethylhexyl)amino]methylphenylphosphinic acid(DEAPP),was synthesized to develop the mutual separation techniques of In(III),Ga(III) and Zn(II).The extraction selectivity for In(III),Ga(III)an...A new extractant,[N,N-di(2-ethylhexyl)amino]methylphenylphosphinic acid(DEAPP),was synthesized to develop the mutual separation techniques of In(III),Ga(III) and Zn(II).The extraction selectivity for In(III),Ga(III)and Zn(II) with DEAPP was higher than that of the commercial phosphorus acid extractants such as D2 EHPA and PC-88 A.The extraction selectivity for metal ions in 1 mol·L-1aqueous ammonium nitrate solution with DEAPP was in the following order:In(III) N Ga(III) N Zn(II).These selective extraction behaviors indicate that the amino moiety of DEAPP plays an important role in the mutual separation of In(III),Ga(III) and Zn(II).The extraction equilibria of In(III),Ga(III) and Zn(II) with DEAPP(=HR) were expressed by the following reactions:In3++ 2HRT2In R3HRT + 3H+,Ga3++ 1.5HRT-2+ NO3 GaR 2eHRT N O3T + 2H+,and Zn2++ 2HRT2 Zn R2HRT2+ 2H+.The extraction equilibrium constants of In(III),Ga(III) and Zn(II) with DEAPP were determined to be Kex,M= 1.7 × 104[dm3·mol-1],4.17 [(dm3·mol-1)0.5],and 1.55 x 10-2[–],respectively.展开更多
The extraction and separation of Fe（III） from heavy metal wastewater generated in zinc smelting process were studied using solvent impregnated resin containing CL- P2O4. The influence of pH and temperature on absorb...The extraction and separation of Fe（III） from heavy metal wastewater generated in zinc smelting process were studied using solvent impregnated resin containing CL- P2O4. The influence of pH and temperature on absorbing heavy metal cations by static adsorption was investigated. The batch tests on adsorption equilibrium, kinetics and elution efficiency were carried out to evaluate the performance of CL-P204. Column operations for extraction and separation of Fe（III） by CL-P2O4 were performed for further optimization of process parameters and feasibility evaluation. The reaction mechanism of Fe（III） and CL-P2O4 was analyzed through saturation capability, slope analysis and infrared spectroscopy （IR）. The results show that the separation of Fe（III） from heavy metal wastewater using CL- P2O4 can be achieved through process of adsorption and desorption at a flow rate of 1.53 ml·min^-1·cm^-2, pH 0.8 and temperature of 25℃. The experimental data of Fe（III） adsorption by CL-P2O4 have a satisfactory fit with Langmuir adsorption equation and Freundlich adsorption isotherms. The probable molecular formula of extracted complex is Fe[R2（R2H）], and the adsorption reaction equation is concluded as following： Fe3＋ ＋ 4RH 〈=〉Kex Fe[R2（R2H）] ＋ 3H＋ （Kex, extraction equilibrium constant）. This study will supply the fundamentals for treatment of heavy metal wastewater.展开更多
A selective method has been developed for the extraction chromatography of aluminium(Ⅲ) and its separation from several metal ions with a chromatographic column containing N-n-octylaniline ( a liquid anion exchanger)...A selective method has been developed for the extraction chromatography of aluminium(Ⅲ) and its separation from several metal ions with a chromatographic column containing N-n-octylaniline ( a liquid anion exchanger) coated on silanized silica gel as a stationary phase. The aluminium(Ⅲ) was quantitatively extracted with the 0. 065 mol / L N-n-octylaniline in 0. 013 to 0. 05 mol / L sodium succinate at a flow rate of 1. 0 mL / min. The extracted metal ion has been recovered by eluting with 25. 0 mL of 0. 05 mol / L hydrochloric acid and estimated spectrophotometrically with aurintricarboxylic acid. The effects of the acid concentration,the reagent concentration,the flow rate and the eluting agents have been investigated. The log-log plots of distribution coefficient ( K d ( Al(Ⅲ) ) ) versus N-n-octylaniline concentration in 0. 005 and 0. 007 mol / L sodium succinate gave the slopes of 0. 5 and 0. 7 respectively and showed the probable composition of the extracted species was 1∶ 1 ( metal to amine ratio ) and the nature of extracted species was [RR' NH + 2 Al succinate 2 ] org. . The extraction of aluminium(Ⅲ) was carried out in the presence of various ions to ascertain the tolerance limit of individual ions. Aluminium(Ⅲ) has been separated from multicomponent mixtures,pharmaceutical samples and synthetic mixtures corresponding to alloys. A scheme for mutual separation of aluminium(Ⅲ) ,indium(Ⅲ) ,gallium(Ⅲ) and thallium(Ⅲ) has been developed by using suitable masking agents. The method is fast,accurate and precise.展开更多
基金supported by The Environment Research and Technology Development Fund (3K133005)
文摘A new extractant,[N,N-di(2-ethylhexyl)amino]methylphenylphosphinic acid(DEAPP),was synthesized to develop the mutual separation techniques of In(III),Ga(III) and Zn(II).The extraction selectivity for In(III),Ga(III)and Zn(II) with DEAPP was higher than that of the commercial phosphorus acid extractants such as D2 EHPA and PC-88 A.The extraction selectivity for metal ions in 1 mol·L-1aqueous ammonium nitrate solution with DEAPP was in the following order:In(III) N Ga(III) N Zn(II).These selective extraction behaviors indicate that the amino moiety of DEAPP plays an important role in the mutual separation of In(III),Ga(III) and Zn(II).The extraction equilibria of In(III),Ga(III) and Zn(II) with DEAPP(=HR) were expressed by the following reactions:In3++ 2HRT2In R3HRT + 3H+,Ga3++ 1.5HRT-2+ NO3 GaR 2eHRT N O3T + 2H+,and Zn2++ 2HRT2 Zn R2HRT2+ 2H+.The extraction equilibrium constants of In(III),Ga(III) and Zn(II) with DEAPP were determined to be Kex,M= 1.7 × 104[dm3·mol-1],4.17 [(dm3·mol-1)0.5],and 1.55 x 10-2[–],respectively.
基金financially supported by the International S&T Cooperation Program of China(ISTCP) (No. 2014DFA90920)
文摘The extraction and separation of Fe（III） from heavy metal wastewater generated in zinc smelting process were studied using solvent impregnated resin containing CL- P2O4. The influence of pH and temperature on absorbing heavy metal cations by static adsorption was investigated. The batch tests on adsorption equilibrium, kinetics and elution efficiency were carried out to evaluate the performance of CL-P204. Column operations for extraction and separation of Fe（III） by CL-P2O4 were performed for further optimization of process parameters and feasibility evaluation. The reaction mechanism of Fe（III） and CL-P2O4 was analyzed through saturation capability, slope analysis and infrared spectroscopy （IR）. The results show that the separation of Fe（III） from heavy metal wastewater using CL- P2O4 can be achieved through process of adsorption and desorption at a flow rate of 1.53 ml·min^-1·cm^-2, pH 0.8 and temperature of 25℃. The experimental data of Fe（III） adsorption by CL-P2O4 have a satisfactory fit with Langmuir adsorption equation and Freundlich adsorption isotherms. The probable molecular formula of extracted complex is Fe[R2（R2H）], and the adsorption reaction equation is concluded as following： Fe3＋ ＋ 4RH 〈=〉Kex Fe[R2（R2H）] ＋ 3H＋ （Kex, extraction equilibrium constant）. This study will supply the fundamentals for treatment of heavy metal wastewater.
基金supported by BCUD,Pune University for providing financial assistance in form of a research project
文摘A selective method has been developed for the extraction chromatography of aluminium(Ⅲ) and its separation from several metal ions with a chromatographic column containing N-n-octylaniline ( a liquid anion exchanger) coated on silanized silica gel as a stationary phase. The aluminium(Ⅲ) was quantitatively extracted with the 0. 065 mol / L N-n-octylaniline in 0. 013 to 0. 05 mol / L sodium succinate at a flow rate of 1. 0 mL / min. The extracted metal ion has been recovered by eluting with 25. 0 mL of 0. 05 mol / L hydrochloric acid and estimated spectrophotometrically with aurintricarboxylic acid. The effects of the acid concentration,the reagent concentration,the flow rate and the eluting agents have been investigated. The log-log plots of distribution coefficient ( K d ( Al(Ⅲ) ) ) versus N-n-octylaniline concentration in 0. 005 and 0. 007 mol / L sodium succinate gave the slopes of 0. 5 and 0. 7 respectively and showed the probable composition of the extracted species was 1∶ 1 ( metal to amine ratio ) and the nature of extracted species was [RR' NH + 2 Al succinate 2 ] org. . The extraction of aluminium(Ⅲ) was carried out in the presence of various ions to ascertain the tolerance limit of individual ions. Aluminium(Ⅲ) has been separated from multicomponent mixtures,pharmaceutical samples and synthetic mixtures corresponding to alloys. A scheme for mutual separation of aluminium(Ⅲ) ,indium(Ⅲ) ,gallium(Ⅲ) and thallium(Ⅲ) has been developed by using suitable masking agents. The method is fast,accurate and precise.
